Note 2 - Real Estate (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 2 - Real Estate (Details) [Line Items]
Finite-Lived Intangible Asset, Acquired-in-Place Leases	$ 35,262,000	$ 31,248,000
Off-market Lease, Unfavorable	181,500,000	167,200,000
Other Rental Property [Member]
Note 2 - Real Estate (Details) [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	252,800,000	212,900,000
Finite-Lived Intangible Asset, Acquired-in-Place Leases	290,838,000	237,166,000
Finite-Lived Customer Relationships, Gross	21,326,000	21,335,000
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	112,979,000	99,166,000
Below Market Rents [Member]
Note 2 - Real Estate (Details) [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	155,700,000	138,300,000
Above and Below Market Leases [Member]
Note 2 - Real Estate (Details) [Line Items]
Amortization of above and below Market Leases	(11,900,000)	(14,900,000)	(12,000,000)
Net of Above Market Leases [Member]
Note 2 - Real Estate (Details) [Line Items]
Below Market Lease, Amortization Income, Next Twelve Months	10,500,000
Below Market Lease, Amortization Income, Year Two	10,800,000
Below Market Lease, Amortization Income, Year Three	11,000,000
Below Market Lease, Amortization Income, Year Four	9,700,000
Below Market Lease, Amortization Income, Year Five	7,400,000
Leases in Place and Tenant Relationships [Member]
Note 2 - Real Estate (Details) [Line Items]
Amortization	33,200,000	30,100,000	26,900,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	18,600,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	15,300,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	12,400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	10,100,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 8,200,000